Viessmann VITODENS 300 Service Instructions Manual page 102

Function description
Control functions
Filling program
Note
Close the gas shut-off valve when
operating the filling program.
In the delivered condition, the chan-
geover valve is set to its central posi-
tion, enabling the system to be filled
completely. After starting the control
unit, the diverter valve no longer goes
into its central position.
Filling with the control unit switched ON
If the system is to be filled with the
control unit switched ON, the change-
over valve will be moved to its central
position via coding address "2F:2"
and the pump will be started. The
burner shuts down if this program is
activated via coding address "2F".
The program is automatically disabled
after 20 minutes, and the coding
address is set to "0".
Screed function
The screed function enables screeds
to be dried. For this, always observe
the details specified by the screed
manufacturer.
102
(cont.)
Afterwards, the changeover valve can
be moved via coding address "2F:2"
into its central position. If, in this posi-
tion, the control unit is switched OFF,
then the system can be filled comple-
tely.
You can select various temperature
profiles.